{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:5MHSPFJMAGM65QZQBENYTSNDFC","short_pith_number":"pith:5MHSPFJM","canonical_record":{"source":{"id":"1305.1968","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-08T22:08:12Z","cross_cats_sorted":[],"title_canon_sha256":"0bdffac7f841575ea0029fbcbefb2a491ca2187b56a4abfce771ed2048bbe50f","abstract_canon_sha256":"b220c9bc4c5e1f099d1fdc227f3e2756bc3c1c4e2ddb9fc8827d004709c3775b"},"schema_version":"1.0"},"canonical_sha256":"eb0f27952c0199eec330091b89c9a3289a5c45dbecfef0514de4b9a5c9f4f2d6","source":{"kind":"arxiv","id":"1305.1968","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.1968","created_at":"2026-05-18T03:09:22Z"},{"alias_kind":"arxiv_version","alias_value":"1305.1968v2","created_at":"2026-05-18T03:09:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.1968","created_at":"2026-05-18T03:09:22Z"},{"alias_kind":"pith_short_12","alias_value":"5MHSPFJMAGM6","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"5MHSPFJMAGM65QZQ","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"5MHSPFJM","created_at":"2026-05-18T12:27:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:5MHSPFJMAGM65QZQBENYTSNDFC","target":"record","payload":{"canonical_record":{"source":{"id":"1305.1968","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-08T22:08:12Z","cross_cats_sorted":[],"title_canon_sha256":"0bdffac7f841575ea0029fbcbefb2a491ca2187b56a4abfce771ed2048bbe50f","abstract_canon_sha256":"b220c9bc4c5e1f099d1fdc227f3e2756bc3c1c4e2ddb9fc8827d004709c3775b"},"schema_version":"1.0"},"canonical_sha256":"eb0f27952c0199eec330091b89c9a3289a5c45dbecfef0514de4b9a5c9f4f2d6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:09:22.145542Z","signature_b64":"LyY16aZ72mRw+MS5EfXCtB3AuelO3tGXldhBB4KTFnZaFOz+9wt+eJkqcJYu8Hr7xjo0giOyjR204CqrEGjZCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb0f27952c0199eec330091b89c9a3289a5c45dbecfef0514de4b9a5c9f4f2d6","last_reissued_at":"2026-05-18T03:09:22.144658Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:09:22.144658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.1968","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:09:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"korAEMxZqIiGMBYzh7M3LbvejC+0xx6VnpLgJ0vANEitGaAHNV3DMMBKO79FSfML0nuSUofAjy7OXyYiperMBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:38:27.074220Z"},"content_sha256":"330ba0a16c232b07acb598f0471cd7f6d3403f03a159de47e483719ec5e38506","schema_version":"1.0","event_id":"sha256:330ba0a16c232b07acb598f0471cd7f6d3403f03a159de47e483719ec5e38506"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:5MHSPFJMAGM65QZQBENYTSNDFC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detection of HI in distant galaxies using spectral stacking","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Brian Boyle, Jacinta Delhaize, Lister Staveley-Smith, Martin Meyer","submitted_at":"2013-05-08T22:08:12Z","abstract_excerpt":"Using the Parkes radio telescope, we study the 21cm neutral hydrogen (HI) properties of a sample of galaxies with redshifts z<0.13 extracted from the optical 2dF Galaxy Redshift Survey (2dFGRS). Galaxies at 0.04<z<0.13 are studied using new Parkes observations of a 42deg^2 field near the South Galactic Pole (SGP). A spectral stacking analysis of the 3,277 2dFGRS objects within this field results in a convincing 12sigma detection. For the low-redshift sample at 0<z<0.04, we use the 15,093 2dFGRS galaxies observed by the HI Parkes All-Sky Survey (HIPASS) and find a 31sigma stacked detection. We "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.1968","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:09:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YLejLBNU8ICVO9aPqFTFsDt9wXapai+AbwyB3JqU0QPgif/eRIu/lQbs0WUKWPwMfGIzW6WwaLVxxT6+ErNPAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:38:27.074603Z"},"content_sha256":"c42abec78e25016d2cd1eb2daf4f9514b0b52ed8e32ab82b6d7f0bba334bae62","schema_version":"1.0","event_id":"sha256:c42abec78e25016d2cd1eb2daf4f9514b0b52ed8e32ab82b6d7f0bba334bae62"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5MHSPFJMAGM65QZQBENYTSNDFC/bundle.json","state_url":"https://pith.science/pith/5MHSPFJMAGM65QZQBENYTSNDFC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5MHSPFJMAGM65QZQBENYTSNDFC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T05:38:27Z","links":{"resolver":"https://pith.science/pith/5MHSPFJMAGM65QZQBENYTSNDFC","bundle":"https://pith.science/pith/5MHSPFJMAGM65QZQBENYTSNDFC/bundle.json","state":"https://pith.science/pith/5MHSPFJMAGM65QZQBENYTSNDFC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5MHSPFJMAGM65QZQBENYTSNDFC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:5MHSPFJMAGM65QZQBENYTSNDFC","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b220c9bc4c5e1f099d1fdc227f3e2756bc3c1c4e2ddb9fc8827d004709c3775b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-08T22:08:12Z","title_canon_sha256":"0bdffac7f841575ea0029fbcbefb2a491ca2187b56a4abfce771ed2048bbe50f"},"schema_version":"1.0","source":{"id":"1305.1968","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.1968","created_at":"2026-05-18T03:09:22Z"},{"alias_kind":"arxiv_version","alias_value":"1305.1968v2","created_at":"2026-05-18T03:09:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.1968","created_at":"2026-05-18T03:09:22Z"},{"alias_kind":"pith_short_12","alias_value":"5MHSPFJMAGM6","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"5MHSPFJMAGM65QZQ","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"5MHSPFJM","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:c42abec78e25016d2cd1eb2daf4f9514b0b52ed8e32ab82b6d7f0bba334bae62","target":"graph","created_at":"2026-05-18T03:09:22Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Using the Parkes radio telescope, we study the 21cm neutral hydrogen (HI) properties of a sample of galaxies with redshifts z<0.13 extracted from the optical 2dF Galaxy Redshift Survey (2dFGRS). Galaxies at 0.04<z<0.13 are studied using new Parkes observations of a 42deg^2 field near the South Galactic Pole (SGP). A spectral stacking analysis of the 3,277 2dFGRS objects within this field results in a convincing 12sigma detection. For the low-redshift sample at 0<z<0.04, we use the 15,093 2dFGRS galaxies observed by the HI Parkes All-Sky Survey (HIPASS) and find a 31sigma stacked detection. We ","authors_text":"Brian Boyle, Jacinta Delhaize, Lister Staveley-Smith, Martin Meyer","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-08T22:08:12Z","title":"Detection of HI in distant galaxies using spectral stacking"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.1968","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:330ba0a16c232b07acb598f0471cd7f6d3403f03a159de47e483719ec5e38506","target":"record","created_at":"2026-05-18T03:09:22Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b220c9bc4c5e1f099d1fdc227f3e2756bc3c1c4e2ddb9fc8827d004709c3775b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-08T22:08:12Z","title_canon_sha256":"0bdffac7f841575ea0029fbcbefb2a491ca2187b56a4abfce771ed2048bbe50f"},"schema_version":"1.0","source":{"id":"1305.1968","kind":"arxiv","version":2}},"canonical_sha256":"eb0f27952c0199eec330091b89c9a3289a5c45dbecfef0514de4b9a5c9f4f2d6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb0f27952c0199eec330091b89c9a3289a5c45dbecfef0514de4b9a5c9f4f2d6","first_computed_at":"2026-05-18T03:09:22.144658Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:09:22.144658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LyY16aZ72mRw+MS5EfXCtB3AuelO3tGXldhBB4KTFnZaFOz+9wt+eJkqcJYu8Hr7xjo0giOyjR204CqrEGjZCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:09:22.145542Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.1968","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:330ba0a16c232b07acb598f0471cd7f6d3403f03a159de47e483719ec5e38506","sha256:c42abec78e25016d2cd1eb2daf4f9514b0b52ed8e32ab82b6d7f0bba334bae62"],"state_sha256":"e462c9ae8b7ce41453ea1a8ad08634fb7c9d772ba78237c19dd802419dfd1b67"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HAFhL3gWpMBRYMKtIJig9Cp7AILA2ART4WoQ6uT/itXyXJCBDHYDT9zsKZLMmP1AIkwQYoHgVLFk85G+bx+YDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T05:38:27.076915Z","bundle_sha256":"d206c10f41adae918487cf135de5276a05ca325895853519addfcf9ac3d5b3d1"}}